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Physical axle model for dynamic tests
Bělunek, Matěj ; Dočkal, Aleš (referee) ; Mazůrek, Ivan (advisor)
The aim of this thesis is the design of a physical axle test station, along with a virtual dynamic model, with the purpose of vehicle suspension tests. The axle, or half-car, model is the answer to the inaccuracies of the most widely utilized suspension model, and the high cost of the full vehicle testing. The motivation for the new test station and its virtual model is the prospect of accurate, quick and effortless testing and optimization of the vehicle suspension characteristics. The existing solutions in most cases substitute actual suspension elements (axle) and wheels with auxiliary parts leading to a departure from reality. The design of the new test station is based on the analysis of current physical model solutions and in accordance with set requirements. The tester substitutes the vehicle Škoda Fabia I Hatchback and utilizes its actual rear axle including suspension elements. The assembled rig, or rather its functionality, is successfully experimentally verified. The created virtual dynamic model, using ADAMS software, is identified against the designed test station, while the obtained simulation results are compared with the experiment data. Meeting the experiment predictions and virtual model results validates the tester’s ability to sufficiently reflect real car suspension behaviour and it is ready for further vehicle spring and damping properties testing.
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Excitation device of the physical axle model
Zeman, Petr ; Čížek, Petr (referee) ; Mazůrek, Ivan (advisor)
The main objective of this thesis was to design an excitation device for a full-axle test station for the simulation of a crossing test over bump, used to verify the springing and damping properties of passenger car wheel suspensions. The motivation for the development of the excitation device of the all-axle station was the need to test the properties of the suspension elements in a real scale, and to add a new form of excitation for the axle model that is built in the laboratory of the IMD FME. Until now, this had only one excitation option, a vibration resonator. Firstly, a virtual dynamic axle model was created by crossing an obstacle in Matlab Simulink, which was mainly used to determine the force load exerted by the simulator. The proposed device is divided into a weighing arm and a drive unit. Using the designed device, the obstacle crossing can be simulated with a height of up to 5 cm at a speed of up to 30 km/h and an axle weight of up to 800 kg. The device also records the force exerted from the wheel to the pad throughout and after the excitation. The developed device meets the specified space and modal behaviour requirements, which does not interfere with the force measurement process. The device operates by forcing a cylindrical barrier under the axle wheel and, in conjunction with an existing axle model, forms a crossover test simulator that will be used for the development and experimental verification of automotive suspension components, such as MR dampers in particular.
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Physical axle model for dynamic tests
Bělunek, Matěj ; Dočkal, Aleš (referee) ; Mazůrek, Ivan (advisor)
The aim of this thesis is the design of a physical axle test station, along with a virtual dynamic model, with the purpose of vehicle suspension tests. The axle, or half-car, model is the answer to the inaccuracies of the most widely utilized suspension model, and the high cost of the full vehicle testing. The motivation for the new test station and its virtual model is the prospect of accurate, quick and effortless testing and optimization of the vehicle suspension characteristics. The existing solutions in most cases substitute actual suspension elements (axle) and wheels with auxiliary parts leading to a departure from reality. The design of the new test station is based on the analysis of current physical model solutions and in accordance with set requirements. The tester substitutes the vehicle Škoda Fabia I Hatchback and utilizes its actual rear axle including suspension elements. The assembled rig, or rather its functionality, is successfully experimentally verified. The created virtual dynamic model, using ADAMS software, is identified against the designed test station, while the obtained simulation results are compared with the experiment data. Meeting the experiment predictions and virtual model results validates the tester’s ability to sufficiently reflect real car suspension behaviour and it is ready for further vehicle spring and damping properties testing.
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